[boost] [typeof] is T registered?

From: Andy Little (andy_at_[hidden])
Date: 2006-02-07 04:33:33

Hi to the typeof developers,

    I am wondering if it is possible to add some functionality so user can tell
if a type is in the database of registered types during compilation. It may be
there already of course.

template <typename T>
struct  Func{
    //one possible use case
    typedef  typename boost::mpl::eval_if<
        boost::is_typeof_registered<T>,    // true if T is registered
        typeof_operation<T>, // use BOOST_TYPEOF
        try_something_else<T>
    >::type type;

};

Its not critical, but I thought it might be useful while libraries are adding
the typeof functionality. Also might help me in the  "[typeof] gcc and typeof in
function return type" thread.

regards
Andy Little